MAIN PANEL DUs Switch to INBD ENG PRI
If the MAIN PANEL DUs switch is turned to INBD ENG PRI, the primary engine display moves to the inboard DU, the PFD format is displayed on the outboard DU and the upper DU blanks.

MAIN PANEL DUs Switch to INBD PFD
If the MAIN PANEL DUs switch is turned to INBD PFD, the PFD format is displayed on the inboard DU and the outboard DU blanks.

MAIN PANEL DUs Switch to MFD
If the MAIN PANEL DUs switch is turned to INBD MFD, the PFD continues to be displayed on the outboard display unit and the inboard display is blank. The system format (SYS) or secondary engine format (ENG) can then be selected to the inboard display unit and lower display unit with the MFD switches on the engine display control unit.
Copyright . The Boeing Company. See title page for details.
10.21.10  April 28, 2000

Flight Instruments, Displays -PFD/ND System Description

Lower Display Switching

LOWER DU Switch to ENG PRI
If the LOWER DU switch is turned to ENG PRI, the engine display moves to the lower DU and the upper DU blanks.

LOWER DU Switch to ND
If the LOWER DU switch is turned to ND, the engine display is shown on the upper DU and the navigation display is shown on the lower DU. When the MFD ENG switch is selected, the compact engine display is shown on the upper DU.
Copyright . The Boeing Company. See title page for details.
Flight Instruments, Displays -PFD/ND System Description 737 Flight Crew Operations Manual

Display System Information Sources
Air Data Inertial Reference System (ADIRS)
The ADIRS produces flight data such as position, speed, altitude and attitude for the flight displays, flight management computers, flight controls, engine controls and all other systems requiring inertial and air data.
The major components of the ADIRS are:
.  
two air data inertial reference . six static ports
units (ADIRUs) . three pitot probes

.
four air data modules (ADMs) . two alpha vanes
. one inertial system display unit . one total air temperature probe.
(ISDU)

.  one dual mode select unit
(MSU)

CAPT F/OALT
AUXILIARY ALPHA
STATIC STATIC STATIC
PITOT PROBE VANE
PORT PORT PORT
CAPT F/OALTPROBE ALPHA STATIC STATIC STATIC VANE

PORT PORT PORT PITOT LINES STATIC LINES
Air Data Inertial Reference Unit (ADIRU)
The ADIRUs provide inertial position and track data to the FMC as well as attitude, altitude and airspeed data to the displays. The ADIRUs process information measured by internal gyros and accelerometers, and from air data module inputs, the alpha vanes and other systems.
The ADIRUs are described in Chapter 11, Flight Management, Navigation.
Copyright . The Boeing Company. See title page for details.
10.21.12   April 28, 2000

Flight Instruments, Displays -PFD/ND System Description 737 Flight Crew Operations Manual
Air Data
The pitot static system is comprised of three separate pitot probes and six flush static ports. Two pitot probes and four static ports interface with the air data modules. The remaining auxiliary pitot probe and alternate static ports provide pitot and static pressure to the standby instruments. The auxiliary pitot probe is located on the first officer’s side of the airplane.
The air data modules convert pneumatic pressure to electrical signals and send these data to the ADIRUs. Each pitot air data module is connected to its on–side pitot probe; there is no cross connection. The air data module connected to the Captain’s pitot probe sends information to the left ADIRU, while the air data module connected to the First Officer’s pitot probe sends information to the right ADIRU. The remaining air data modules are located at the balance centers of the Captain’s and First Officer’s static ports. The air data module connected to the Captain’s static ports sends information to the left ADIRU, while the air data module connected to the First Officer’s static ports sends information to the right ADIRU.
Angle–of–Attack
There are two alpha vanes, one located on each side of the forward fuselage. The vanes measure airplane angle–of–attack relative to the air mass.
Total Air Temperature
A total air temperature probe is mounted outside the airplane to sense air mass temperature. The temperature sensed by the probe is used by the ADIRUs to compute total air temperature.
Static Air Temperature
Static air temperature, displayed on the CDU PROGRESS page, comes from the ADIRUs, using total air temperature probe information.
Standby Flight Instruments
The standby flight instruments include:
.  
standby magnetic compass YA613 - YC413, YK101 - YK104

.  
　
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